Electrical valve-operating device for blowing-engines.



No. 775,878. PATENTED NOV. .22, 1904.

'r. WELLMAN.

ELECTRICAL VALVE OPERATING DEVICE FOR BLOWING ENGINES. APPLIGATION FILED SEPT. 9/1903.

N0 MODEL. 2 SHEETS-SHEETL Z lzwwfm W No; 775,878. PATENTED NOV. 22, 1904.

T. WELLMAN.

ELEUTRICAL VALVE OPERATING DEVICE FOR BLOWING ENGINEIS.

1 APPLICATION FILED SEPT.9. 1903. 1

no MODEL. .7 2 sums-811E111 2.

. bkmwaZZWsZZzr We. i?5,8'?8. Patented November 1904i.

NiTE STATES ATlENT Option.

SAMUEL T. VVELLMAN, OF CLEVELAND, OHTO, ASSIGNOR TO THE \N ELL- MAN-SEAVER-MORGAN COMPANY, OF CLEVELAND, OHIO, A CORPORA- TION OF OHIO.

ELECTRICAL VALVE-OPERATING DEVICE FOR BLOWiNG-ENGINES.

SPECIFICATION forming part of Letters Patent No. 775,878, dated November 22, 1904:.

Application filed September 9,1903. Serial No. 172,450. No model.)

T whom 1715 W 007L667: dash-pots 13, \vhichin the presentinstancearc Be it known that T, SAMUEL T. vVnLLivmN, a located between the coils of the magnets 11 5 citizen of the United States, and a resident of and 12.

Cleveland, Ohio, have invented certain Im- Theelectrical connections wherebythe vari- 5 provements in Electrical ValveOperatingl)e ous magnets are energized at the proper times vices for Blowing-Engines, of which the folto open and close the inlet and outlet valves lowing is a specification. are as follows: 14: is a switch controlling the 5 5 The object of my invention is to provide flow of current from the supply-line, the posi simple and. effective means for operating elective and negative lines leading from this switch I trically the inlet and outlet valves of the blowbeing indicated by appropriate characters. ing tub or cylinder of a blowing-engine. The negative line is permanently connected This object I attain in the manner hereinto one terminal of each of the magnets, the 60 after set forth, reference being had to the acpositive line being alternately connected to or companying drawings, in which disconnected from the other terminal of each I 5 Figure 1 is a vertical section of the blowing magnet, depending upon whether or not said tub or cylinder ofabloWing-engine with valves magnet is to be energized. Said positive line I and electrical operating devices therefor in achas four terminals 15, 16, 17, and'18 adjacent to 5 cordance with my invention, the current conthe currentcontroller or distributer, which, trolling or directing device being shown as shown in Fig. 3, is in the form of a rotating developed upon a flat plane in order to more drum 35, intended to be connected to the crankclearly illustrate the operation of the same. shaftorotherrotating-memberof theengine,so Fig. 2 is a transverse section on the line a a, as to make one revolution for each complete 7 Fig. 1; and Fig. 3 is a side elevation of the back-and-forth stroke of the piston 52. On this current controlling or directing device. drum are contacts 19, 20, 21, 22, 23, and 24,

2 5 1 represents the blowing tub or cylinder of extending but half-Way around the drum, the a blowing-engine, 2 the piston of the same, contact 19 being in line with the terminal 15, and 3 the piston-rod, the latter being reciprothe contact 20 being in line with the terminal 75 cated either by direct connection with the pis- 16, the contacts 21 and 22 being in line with ton of a steam or other power cylinder or by the terminal 17, and the contacts 23 and 24 3 connection withacrank-shalt or other powerbeing in line with the terminal 18, and said transmitting device operated thereby. The contacts 19, 20, 21, 22, 23, and 2A are connected cylinder has at one end an inlet-valve chest 4, to contacts 19, 20, 21, 22, 23, and 24:, re- 0 with valve 4, and an outlet-valve chest 5, with 'spectively, on a smaller drum 25 at one end valve 5, the other end of the cylinder being of the drum 35.

provided with an inlet-valve chest 6, having a The contact 20 is in line with the terminal valve 6, and an outlet-valve chest 7, having a of a line 20, which communicates with one valve 7. Each valve has a stem 8, which proterminal of the clOSiI1g'-nnig'net 12 of the inlet- 5 jects into a closed casing 9 and is there convalve 6 and with a terminal of the openingnected to an armature 10, which can be acted magnet 11 of the other inlet-valve, at.

4 upon by either of a pair of electromagnets 11 The contact 1Q is in line with the terminal or 12, one of these magnets constituting the of a line 19", which is connected to a terminal valve-opening magnet and serving to move the of the opening-magnet ll of the inlet-valve 6 9 armature in one direction, and the other conand to a terminal of the closing-magnet 152 of stituting the valve-closing magnet and servthe inlet-valve 1.

ing to move the armature in the opposite di- The contact 523 is in line with the terminal rection, movement in either direction being of a line 23 which communicates with the retarded to some extent by means of plungers terminal of the closing-magnet oi the outlet- 9 5 secured to the valve-ste1n and contained in valve 5.

- Thus if the terminal is adjusted to a position The contact 2r is in line with the terminal i of a line 2 1, which connects with the terminal of the opening-magnet 11 of said outlet-valve 5. j

The contact 22 is in line with the terminal of a line 22", which communicates with the terminal of the closing-magnet 12 of the outletvalve 7 and the contact 21 is in line with the terminal of a line 21 which connects with a terminal of the opening-magnet 11 of said outlet-valve 7.

As a result of this construction the upper inlet-valve 1 will be held in the open position, and the lower inlet-valve 6 will be closed during the stroke of the piston 2 from the top to the bottom of the tub or cylinder 1that is to say, during one half-revolution of the drum 19whereupon the position of these valves will be changed, the valve 1 being closed and the valve 6 opened and the valves retaining this position during the upward stroke of the piston.

Each of the outlet-valves 7 is retained in a closed position during that stroke of the piston 2 which is away from the valve; but during that stroke of the piston which is toward each outlet-valve said valve is closed for a portion of the stroke and open for a portion of the strokethat is to say, it is closed during the earlier portion of the stroke until the air has been compressed in the cylinder to the same extent as in the receiver and is then opened, so as to permit flow of this compressed air from the cylinder to the receiver.

While each of the inlet-valves is therefore held open during a complete half-turn of the drum 35, the time during which the outletvalve remains open must be determined by the pressure of air in the receiver-that is to say, the greater this pressure the longer will be the time and the greater the extent of stroke of the piston 2, during which the outlet-valve remains closed, and the lesser the pressure the lesser the time during which said valve remains closed.

In order to accomplish this result, the contacts 21 and 2 1 are of tapering form-that is to say, they present an edge which is oblique to their respective terminals 17 and 18, and the latter are movable in line with the axis of the drum 35, so that the position of the terminals longitudinally in respect to the drum and its contacts 21 and 2% will determine the fractional part of the rotation of the drum, during which the outlet-valve controlled by either contact is permitted to remain open.

adjacent to the wide end of the contact the valve will remain open during almost the entire half-revolution of the drum 35 and the entire stroke of the piston 2 from one end of the tub or cylinder 1 to the other; but if the terminal is adjusted to a position adjacent to the narrow end of the contact the valve will remain open only for a very limited period near the end of the stroke of the piston. This adjustment of the terminals 17 and 18 is effected by mounting them upon a guide-rod 26 in front of and parallel with the drum 35 and connecting them by means of a bar 27, which is under control of one arm of a three-armed lever 28, a second arm of said lever being acted upon by a spring 29 and a third arm 1 of the lever being connected by a link 30 to a piston 31, which is within the cylinder 32, the latter being open through a pipe 33 to the pressure in the receiver.

As the pressure increases, therefore, there will be such movement of the lever 28 as to carry the terminals 17 and 18 toward the narrow ends of the contacts 21 and 24, thereby gradually decreasing the period of time during which the outlet-valves 5 and 7 remain open, and consequently increasing the extent to which the air is compressed in the cylinder before being permitted to escape therefrom, and, on the other hand, decrease of pressure in the receiver will permit movement of the lever 28 under the influence of the spring 29, so as to carry the terminals 17 and 18 toward the wide ends of the contacts 21 and 24, thereby increasing the period that the outletvalves are permitted to remain open during each stroke of the piston, and thus permitting escape of air from the cylinder when the same has been subjected to a lesser degree of compression than when the outlet-valves remain closed for a longer time.

The coils of the magnets 11 and 12 are tubular, and each armature 10 has projecting bars 3 1 entering said tubular coils, and, if desired, these bars may act as solenoids to increase the attractive power of magnets upon the armature.

l/Vhile I prefer in all cases to use electromagnets for eifecting the movements of the valves in each direction, such magnets may be employed for moving the valves in but one direction only, movement of the valves in the opposite direction being effected by means of a spring,weight, or other mechanical pressure device.

The chambers within the magnet-casings 9 are in open communication with the respective valve-boxes, so that no stufiing-boxes for the valve-rods 8 are necessary, and hence there is no friction upon said valve-rods.

Having thus described my invention, I claim and desire to secure by Letters Patent 1. The combination of the blowing tub or cylinder of a blowing engine, with outletvalves, valve-operating electromagnets, and connections whereby each valve is opened during only a portion of the stroke of the piston, and such period of opening is varied in accordance with the pressure in the receiver, substantially as specified.

2. The combination of a blowing tub or cylinder, of a blowing-engine, valves therefor,

ICC

electromagnets for operating said valves, and I a rotating current-distributer having contacts thereon, some of which present oblique faces, terminals movable in respect to said oblique faces of the contacts, and air-pressure devices for effecting such adjustment of the terminals, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

SAMUEL 'l. W ELL'MAN.

Vitnesses:

(J. W. COMSTOCK, W. A. Jones. 

